Quoted from Grizlyrig:
You would have to weigh each weight on a postal scale to get it right or run the risk of burning up the motor bearings prematurely.
I always thought a shaker was inherently an unbalanced system. Hence, the shake. The weights are intentionally offset. So if you’re saying a gram on one end or the other is the extra weight that will throw the entire system off, I’m crying foul.